A8 Quattro Sedan V8-4.2L (BVJ) (2008)
Expansion Block/Orifice Tube: Service and Repair
Refrigerant Circuit
Restrictor
‹› Only install a red restrictor on this vehicle. The color may also appear orange depending on the manufacturer.
‹› Differently colored replacement restrictors "yellow" colored, diameter of bore / constriction 1.54 mm, restrictor "red" colored, diameter of bore /
constriction 1.42 mm), therefore heed assignment different matching of refrigerant circuit.
‹› Refrigerant lines from evaporator to compressor / reservoir are available in different versions, depending on vehicle model.
Removing
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Drain the refrigerant circuit.
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Disconnect refrigerant line at threaded connection - A - seal open connections.
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Pull restrictor - B - out of refrigerant line using needle nose pliers.
Installing
‹› Only install restrictors of same type; restrictors with different colors have different bore diameters.
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Check O-ring - C - (7.5 mm; 1.5 mm) for correct seating in groove.
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Coat O-ring of restrictor and at threaded connection lightly with refrigerant oil before installation. Refer to => [ Refrigerant Circuit O-Ring Seals ]
See: Description and Operation/Refrigerant Circuit O-Ring Seals.
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Install restrictor - B - accurate to side arrow on restrictor faces evaporator.
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Check seating of restrictor, it must seat in refrigerant line free of play
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Replace O-ring - D - (11.1 mm; 1.8 mm).